Improvement in dies for forming articles of plastic materials



J. uss. Die for Forming Articles of Plastic Materials.

No. 196,420. Patented Oct. 23, 1877.

QRQA.

ONATHAN BLISS, OF JERSEY CITY, NEW JERSEY, ASSIGNOR TO WILFOBD L.PALMER, OF NEW YORK, N. Y.

IMPROVEMENT IN DIES FOR FORMING ARTICLES 0F PLASTIC MATERIALS.

Specification forming part of Letters Patent No. 196,420, dated October23, 1877; application filed I September 8, 1877.

To all whom it may concern:

Be it knownthat I, JONATHAN BLrss, of Jersey city, in the county ofHudson and State of New Jersey, have invented a new and usefulImprovement in Dies for Forming Articles of Plastic Materials, whichimprovement is fully set forth in the following speci fication,reference being had to the accompa nying drawing, in which- Figure 1represents a longitudinal vertical section of a die containing myimprovement. Fig. 2 is a plan view of the lower section thereof. Fig. 3is an inverted plan view of the upper section of the same. Fig. 4 is aside elevation of the plunger.

Similar letters indicate corresponding parts.

My improvement relates to a die which is designed for producing articlesof use and ornament of plastic materials or compositions and it consistsin a lower part or section having a matrix, and a recess surroimdingsaid matrix, and comnnmicating therewith over the top edge thereof, incombination with an upper part or section carrying a plunger or punch,which is fitted to said matrix, and is so arranged that, when the twoparts or sections of the theme brought together, said phmger or punchcan be made to enter the matrix, and thus, if the matrix is previouslyfilled with a plastic material or composition, the same is pressed intoshape by the plunger, while the surplus material escapes into the recesssinrounding and communicating with the matrix, the upper edge of saidmatrix and the lower edge of the plunger being sharp, so that a cleanedge or finish is given to the article produced.

In the drawing, the letters A B designate the upper and lower sectionsof my die, the same being kept in place, when brought together, bydowel-pins a, projecting from one of said sections and entering socketsin the other, or by any other suitable means. In

the lower section B is formed a matrix, 0, and a recess,-D, which lattersurrounds said matrix and communicates therewith over the top edgethereof when the sections A B are brought together, the top edge of thematrix being sunken below the top edge of the lower section B of thedie, as seen in Fig. 1. In the upper section A is formed a hole, 11, ofequal diameter to the matrix C, andinto this hole is fitted a plunger orpunch, E, the latter being thus also fitted to the matrixO.

The material or composition to be compressed can be introduced into thematrix 0 either before the upper and lower sections A B are broughttogether, or through the hole occupied by the plunger E after thesections are brought together. After the matrix C is filled the plungerE is subjected to pressure, and thus brought to bear on the material orcomposition, which thus assumes the shape of the matrix and of the lowerend of the plunger, while the surplus or waste material escapes into therecess D. The upper edge of the matrix 0, as well as the lower edge ofthe plunger E, is sharp, and thus the surplus material is cut off whenthe pliuiger descends into the matrix, and the'article produced has aclean edge or finish.

W hat I claim as new, and desire to secure by Letters Patent, is-

The combination, in a die for forming articles of plastic materials orcompositions, of a lower part or section, B, having a matrix, C, and arecess, D, surrounding said matrix, and communicating therewith over thetop edge thereof, with an upper part or section, A, carrying a plungeror punch, E, which is fitted to said matrix, both the matrix and saidplunger being constructed with sharp edges, and the whole being adaptedto operate sub stantially as described.

In testimony that I claim the foregoing I have hereunto set my hand andseal this 6th day of September, 1877.

JONATHAN BLISS. IL. s.]

